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Multiply by 12, 16, 18 and 24 Worksheet

Maths tricks trick 19: Factor chains for multiplying · Set 702 · 40 questions
TalentJR

The trick (Chain the factors): Split the multiplier into two small factors: 12 = 3 × 4, 14 = 2 × 7, 15 = 3 × 5, 16 = 4 × 4, 18 = 2 × 9, 24 = 4 × 6. Multiply by the first factor. Multiply that answer by the second factor (× 4 is double, double).

NameDateTime takenScore ___ / 40
  1. 1.22 × 15 =
  2. 2.29 × 14 =
  3. 3.24 × 14 =
  4. 4.30 × 18 =
  5. 5.26 × 14 =
  6. 6.40 × 18 =
  7. 7.33 × 15 =
  8. 8.47 × 18 =
  9. 9.20 × 24 =
  10. 10.30 × 24 =
  11. 11.11 × 16 =
  12. 12.28 × 24 =
  13. 13.48 × 18 =
  14. 14.28 × 12 =
  15. 15.42 × 14 =
  16. 16.12 × 24 =
  17. 17.39 × 16 =
  18. 18.43 × 12 =
  19. 19.38 × 15 =
  20. 20.17 × 12 =
  21. 21.44 × 16 =
  22. 22.24 × 15 =
  23. 23.34 × 18 =
  24. 24.45 × 12 =
  25. 25.37 × 12 =
  26. 26.33 × 12 =
  27. 27.32 × 18 =
  28. 28.31 × 12 =
  29. 29.47 × 15 =
  30. 30.19 × 15 =
  31. 31.39 × 24 =
  32. 32.45 × 15 =
  33. 33.26 × 18 =
  34. 34.25 × 24 =
  35. 35.14 × 12 =
  36. 36.20 × 16 =
  37. 37.19 × 24 =
  38. 38.22 × 18 =
  39. 39.47 × 16 =
  40. 40.27 × 12 =

Answer key

  1. 330
  2. 406
  3. 336
  4. 540
  5. 364
  6. 720
  7. 495
  8. 846
  9. 480
  10. 720
  11. 176
  12. 672
  13. 864
  14. 336
  15. 588
  16. 288
  17. 624
  18. 516
  19. 570
  20. 204
  21. 704
  22. 360
  23. 612
  24. 540
  25. 444
  26. 396
  27. 576
  28. 372
  29. 705
  30. 285
  31. 936
  32. 675
  33. 468
  34. 600
  35. 168
  36. 320
  37. 456
  38. 396
  39. 752
  40. 324

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